A New Software Tool for Design, Optimization, and Complete Analysis of Rotating Electrical Machines Windings

Abstract

In this paper, a new software tool developed by the authors for ac winding design, optimization, and complete analysis is presented. In particular, this software can be used as a valid aid in design and analysis for a wide variety of motor and generator windings with generic number of phases (including the case of those machines in which some slots are left empty), pole pairs, slot number, and so on. The calculation of winding factors and the evaluation of their harmonic distribution is also accomplished. The software is implemented in the MATLAB programming environment. By means of some examples, covering the most relevant winding types, the capabilities of this software will be shown. In particular, integer and fractional slot, single- and double-layer winding, concentrated windings, imbrication, belt widening, and belt shifting techniques can be treated to reduce particular harmonics in the electromotive force (EMF) or in the magnetomotive force (MMF). Finally, the connections, the winding factor harmonic distribution, the total harmonic distortion (THD) of EMF and spatial distribution of both the MMF, the Görges polygon, and the flux density are shown together with an estimate of the differential leakage and the air-gap flux density spatial distribution. The software presented in this paper is very modular, highly structured, and flexible due to the conspicuous number of operations that it can fulfill. Clearly, for the sake of brevity and clarity, the authors limit to represent the main features of the software, without going into specific details of programming and coding. All the main mathematical relationships that are useful to solve the problem of design and optimization of the windings of rotating machines are hereafter presented.